What is Kubernetes Horizontal Pod Autoscaler (HPA)?

Question

Accepted Answer

**HPA** — automatically scales Pod replicas based on metrics.

```yaml
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: myapp-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myapp
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70
  - type: Resource
    resource:
      name: memory
      target:
        type: Utilization
        averageUtilization: 80
```

```bash
kubectl get hpa
kubectl describe hpa myapp-hpa
kubectl autoscale deployment myapp --min=2 --max=10 --cpu-percent=70
```

**Requirements:**
- Metrics Server installed.
- Resource requests defined on Pods.

DevOps: What is Kubernetes Horizontal Pod Autoscaler (HPA)?